PVS-Studio warning V597 for apr

static void MD5Transform(....)
{
  apr_uint32_t a = state[0], b = state[1],
               c = state[2], d = state[3],
               tmpbuf[APR_MD5_DIGESTSIZE];
  ....
  if (x == tmpbuf)
  {
     /* Zeroize sensitive information. */
     memset(tmpbuf, 0, sizeof(tmpbuf));
  }
}

This suspicious code was found in apr project by PVS-Studio static code analyzer.
Warning message is:
V597 The compiler could delete the 'memset' function call, which is used to flush 'tmpbuf' buffer. The RtlSecureZeroMemory() function should be used to erase the private data. libaprutil apr_md5.c 436

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